First of all, expand the left hand side:

Sum like terms:

Add 3 to both sides:

Subtract 3x from both sides:

So this is the solution. Every number smaller than 8 (excluded) is part of the solution of this inequality.
AC = AC
answer
reflexive property
To find midpoint, you would add the numbers and divide it by the amount of numbers. So it would be 0.12+0.13 divided by 2 because you have 2 numbers. That would equal .25 divided by 2 also known as .125, the final answer.